[kudu-CR] KUDU-2069 p9: add timestamps to tserver states

["Andrew Wong (Code Review)" <ge...@cloudera.org>]

Hello Alexey Serbin, Kudu Jenkins, Adar Dembo, 

I'd like you to reexamine a change. Please visit

    http://gerrit.cloudera.org:8080/14370

to look at the new patch set (#4).

Change subject: KUDU-2069 p9: add timestamps to tserver states
......................................................................

KUDU-2069 p9: add timestamps to tserver states

This patch include timestamps to each tserver states so an operator can
know when a given tserver state was enacted. This patch plumbs this into
the Master's web UI's "Tablet Servers" page.

Here is a an example of the Master's web UI with tservers of various
statuses:
https://imgur.com/kny5vHu

When the state are removed, the section in the web UI does not show up:
https://imgur.com/itWD0DB

Change-Id: I1b437ad38ad6abcaae894a782ab6d52857c97741
---
M src/kudu/gutil/walltime.cc
M src/kudu/gutil/walltime.h
M src/kudu/master/master.proto
M src/kudu/master/master_path_handlers.cc
M src/kudu/master/master_service.cc
M src/kudu/master/ts_manager.cc
M src/kudu/master/ts_manager.h
M www/tablet-servers.mustache
8 files changed, 131 insertions(+), 33 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/70/14370/4
-- 
To view, visit http://gerrit.cloudera.org:8080/14370
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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I1b437ad38ad6abcaae894a782ab6d52857c97741
Gerrit-Change-Number: 14370
Gerrit-PatchSet: 4
Gerrit-Owner: Andrew Wong <aw...@cloudera.com>
Gerrit-Reviewer: Adar Dembo <ad...@cloudera.com>
Gerrit-Reviewer: Alexey Serbin <as...@cloudera.com>
Gerrit-Reviewer: Kudu Jenkins (120)